JP3055529B2 - Electric water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric water heater for beverages.

[0002]

2. Description of the Related Art In supplying hot water for beverages, a large-capacity electric pot of 5 L class has recently been provided.

[0003] However, in places where a relatively large amount of hot water is required, such as a workplace or a convenience store, the amount of hot water is still insufficient with the ordinary electric kettle.

Therefore, in response to such a request, for example, 1
It is conceivable to provide an electric water heater in which a large water tank of about 0 L is provided, and water in the water tank is heated and boiled and kept at a desired temperature.

[0005]

However, in the case of a water heater in which only the capacity of a single water heater tank is increased as described above, there are the following problems.

(1) It is difficult to continuously supply water when the amount of hot water decreases.

(2) If the required amount of water is newly replenished when the amount of hot water decreases, the temperature of the hot water drops significantly, and long-time boiling is required again.

(3) In order to replenish the water, it is necessary to carry the water in some kind of container and to pour it into the kettle.

The inventions of the present application have been made to solve the above-mentioned problems, respectively. By providing a water supply tank for supplying water in accordance with a decrease in the amount of hot water in the water heater tank, separately from the water heater tank. It is another object of the present invention to provide an electric water heater capable of supplying a large amount of hot water having a desired temperature.

[0010]

Means for Solving the Problems In order to achieve the above objects, the present invention has the following means for solving the problems.

(1) The invention of claim 1 First, the electric water heater of the invention of claim 1 of the present application comprises a water heater tank containing a predetermined amount of water, and a heating means for heating water in the water heater tank. A water supply tank for refilling the water in the kettle tank in accordance with a decrease in the water in the water tank, and a water tank storage support for holding the water tank so that it can be arbitrarily stored or taken out. In the electric water heater, a water receiving container which is provided at a lower portion of the water supply tank storage support portion and retains a predetermined amount of water from a water supply port of the water supply tank, and the water heating tank which supplies water in the water receiving container via a water supply passage. An electric water supply pump for supplying water to the inside, an electric water supply pump on the water heating tank side for supplying water in the water heating tank to the outside through a water supply passage, and an electric water supply pump near the full water level on the water heating tank side. A water level drop detecting means for detecting that the water level in the water heater tank has dropped a predetermined water level from the full water level, and a water level in the water heater tank according to the water level drop detection result of the water level lowering detection means so that the water level in the water heater tank becomes full. An electric water supply pump drive control means for driving the electric water supply pump to supply water is provided.

Therefore, in this configuration, even if the amount of hot water in the water heater tank decreases due to use, water is always appropriately replenished from the water supply tank side by the electric water supply pump via the water receiving container in accordance with the reduced amount. As a result, a constant amount of hot water can always be held without causing a large decrease in the amount of hot water. Since an electric hot water supply pump for supplying the water in the hot water tank to the outside through a hot water supply path is provided on the water heating tank side, the external hot water supply is also performed electrically by the electric hot water supply pump.

In this case, the water supply tank is housed and supported so that it can be arbitrarily housed or taken out of the water heater main body.

Therefore, when the water tank is emptied as a result of the water being supplied to the water heater tank as described above, and it becomes necessary to refill the water tank, the water tank is refilled. The water can be taken out and arbitrarily refilled with new water, and the work of refilling the water in the water supply tank becomes easy.

Further, in this configuration, the water level drop detecting means and the water level drop detecting means for detecting that the water level in the water heater tank is lower than the full level by a predetermined level near the water level on the water heater tank side. And an electric water supply pump drive control means for supplying water by driving the electric water supply pump so that the water in the water heater tank becomes a constant amount in accordance with the water level drop detection result. When the water decreases to a certain extent from the full water level, the water in the water receiving container is quickly replenished in accordance with the reduced amount, and the liquid level in the water heater tank is maintained at a substantially constant full water level. Become like

Therefore, in the case of this configuration, not only is the water level of the water tank maintained at a substantially constant level in the water heater tank as described above, but also at one time after the water in the water heater tank is greatly reduced to an empty state. Unlike a case where a large amount of water is supplied and the water is re-boiled, a stable water supply function without a decrease in the temperature of the hot water can be realized.

(2) Invention of Claim 2 Next, in the electric water heater of the invention of the second aspect of the present invention, in the configuration of the first aspect of the present invention, the water supply tank is installed beside the water heater tank. I have.

Therefore, the height of the water heater main body is reduced, and the restrictions on the installation location in the vertical direction are reduced accordingly.

(3) Invention of Claim 3 Next, the electric water heater of the invention of a third aspect of the present invention is the electric water heater of the first or second aspect of the present invention, wherein A water stop valve that closes the water supply port in a state where the water is taken out is provided.

Therefore, in the case of this configuration, when the water supply tank is taken out to replenish the water as described above, the water supply port is closed accordingly, so that the operation of supplying water into the water supply tank becomes easy.

(4) Invention of Claim 4 Next, the electric water heater of the invention of a fourth aspect of the present invention is the electric water heater of the first, second or third aspect of the present invention in which water is supplied from the water supply tank to the water heater tank. The road is provided with heating means.

Therefore, according to this configuration, the water supplied from the water supply tank to the water heater via the water receiver can be heated to a predetermined temperature in advance, and the fluctuation of the water temperature in the water heater can be further improved. Is not caused. As a result, there is no need to reheat water.

(5) Invention of Claim 5 Next, in the electric water heater of the invention of the fifth aspect of the present invention, in the configuration of the first, second, third or fourth aspect of the present invention, It is characterized in that a water level drop detecting means for detecting a drop in the water level in the water receiving container is provided.

Therefore, with this configuration, it is possible to detect the decrease in the water in the water supply tank from the decrease in the water level in the water receiving container itself and the decrease in the water level in the water receiving container.

(6) Invention of Claim 6 Next, in the electric water heater of the invention of a sixth aspect of the present invention, in the configuration of the invention of the fifth aspect, the means for detecting a decrease in the water level in the water receiving container is provided with a water receiver. It is characterized in that the drive of the electric water supply pump is stopped upon detecting that the water level in the container has dropped below the predetermined water level.

Therefore, in this configuration, when the water level in the water receiving container falls below the predetermined water level, the drive of the electric water supply pump is stopped, and cavitation of the electric water supply pump is prevented.

(7) Invention of Claim 7 Next, in the electric water heater of the invention of a seventh aspect of the present invention, in the configuration of the invention of the fifth or sixth aspect, the means for detecting a decrease in the water level in the water receiving container comprises: It is characterized in that it detects that the water level in the water receiving container has dropped below the predetermined water level, and notifies that the water in the water supply tank is empty.

Therefore, in this configuration, when the water level in the water receiving container drops below the predetermined water level and the water in the water supply tank becomes empty, the same fact is notified to the user. As a result, the user can appropriately refill the water in the water supply tank.

[0029]

(Embodiment 1) FIGS. 1 to 7 show a configuration of an electric water heater according to Embodiment 1 of the present invention.

First, in FIG. 1 showing the entire configuration of the electric water heater, reference numeral 1 denotes a water heater tank 2 on a front side (a front side facing a user during use) through a heat insulating material 64.
Is a main body case of the electric water heater in which the water supply tank 3 is stored on the rear side (back side). This body case 1
For example, it is made of a box-shaped case made of synthetic resin, and a hot water supply port cover 1a is provided on an upper part on the front side thereof, which projects in an eave shape toward the front side by a predetermined width, with its lower part opened.

A predetermined operation panel section 65 is provided on the upper surface of the hot water supply port cover 1a, and on the lower surface side thereof, for example, a hot water supply switch 67, a hot water display lamp (LED) 68a, and a heat insulator, as shown in FIG. Display lamp (LED) 6
8b, an operation board 66 provided with an empty notification lamp (LED) 68c of a water supply tank and the like is provided in a state where the hot water supply switch 67 can be operated externally.

Inside the main body case 1, a water tank support member 5 having a different diameter sleeve structure is fixedly provided on the main body case 1 side, which is located at an upper portion on the front side.
The water heater tank 2 is stored and supported by engaging the outer edge of the upper opening 2b of the water heater tank 2 with the inner edge of the lower small-diameter cylindrical body portion 5a.

A synthetic resin cover for covering the opening 2b of the water heater tank 2 is provided between the upper-side large-diameter tube portion 5b and the lower-side small-diameter tube portion 5a of the water heater tank support member 5. A member 8 is provided, and a rubber packing 87 is provided on the outer peripheral edge.
Opening 2b of water heater tank 2 through inner lid 86 provided with
Is fitted. Note that the inner lid 86 is provided with a plurality of holes 86a for discharging steam.

The lid member 8 is provided with an inner cover 8a corresponding to the opening 2b of the water heater tank 2 via the inner lid 86.
And an outer cover 8b fitted to and integrated with the inner cover 8a from the upper side in a state where a heat insulating space 85 having a predetermined volume is formed between the inner cover 8a and the inner cover 8a. A concave portion 81 is formed in a central portion on the upper surface side of the outer cover 8b.
Is formed, and a convex handle portion 82 is provided at the center thereof. The inner cover 8a and the outer cover 8b are fitted to each other and communicate upward from below, and the steam discharge pipes 8 discharge the steam in the water heater tank 2 to the outside.
3, 84 are provided.

In the main body case 1, a water supply tank supporting member 6 also having a different-diameter sleeve structure is provided at a lower portion on the rear side thereof. The outer periphery of the bottom 3a of the water supply tank 3 is placed on the bottom of the water supply tank 3, and the cap 31 is screwed into the cylindrical opening 6 provided at the center of the bottom 3a of the water supply tank 3 in the lower small-diameter cylindrical body 6b. The water supply tank 3 is housed and supported by fitting in the fitted state as shown. Also,
Below the small-diameter cylindrical portion 6b on the lower side of the water supply tank support member 6, a water receiving container 38 for retaining water from the water supply tank 3 is integrally formed as shown in the figure. An angle-shaped upper cover 5c extending from the water heater tank support member 5 is connected to the water heater tank 2 side of the large-diameter cylindrical body portion 6a on the upper side, and the above-described heat insulating material contacts the inside thereof. 64 are provided.

The water supply tank 3 is made of, for example, a synthetic resin such as polyethylene, and is provided with a handle portion 32 having a lower hole 32a through which the tip of a hand can be inserted and carried. By holding the handle 32 upward from the illustrated storage position, the handle 32 can be taken out of the main body case 1 through the upper opening 1c (see the arrow in FIG. 3).

On the other hand, the cap 3 of the lower opening 30
At the center, a cylindrical water supply port 33 is further provided. In the water supply port 33, when the water supply tank 3 is housed as shown in FIG. While the valve is pushed upward by the provided valve body push-up member 34 to open the valve, when the valve is lifted upward from the storage state in the drawing, the valve is pushed downward by the urging force of the coil spring 36b to close the valve, and the water supply port is opened. A water stop valve 36 that closes 33 is provided. This water shutoff valve 36 is provided, for example, in FIGS.
As shown in detail in FIG. 2, a valve body 36a supported in the cylindrical water supply port 33 so as to be able to move up and down, a coil spring 36b for constantly urging the valve body 36a in a downward valve closing direction, and a coil spring 36b A lower end 37a having a flange portion for locking the coil spring of the shaft portion 37 of the valve body 36a. On the other hand, in a state in which the valve body push-up member 34 is not brought into contact with the water supply tank 3 as shown in FIG.
The lower surface of the valve head 38 of the valve body 36a is moved downward by the urging force of the coil spring 36b interposed between the flange of the lower end 37a and the support member 36c in the extension direction.
Closes the water supply port 33 by contacting the upper end side opening edge 33a of
Maintain water shutoff.

On the other hand, when the water supply tank 3 is housed in the main body case 1 as shown in FIG. 2, its water supply port 33 corresponds to a push-up member 34 provided upright in the water receiving container 38, and The valve body push-up member 34 pushes up the valve body 36a upward against the urging force of the coil spring 36b in the valve closing direction, and opens the water supply port 33 as shown in the figure.
The inside of the water supply tank 3 is communicated with the upper part in the lower water receiving container 38. Thereby, the lower end side opening edge portion 3 of the cylindrical water supply port 33 is placed in the water receiving container 38.
The water in the water supply tank 3 is transferred until a full water level FL as shown in FIG.

As shown, a float switch 46 for detecting that the water in the water supply tank 3 has run out from a change in the water level in the water receiving container 38 is provided in the water receiving container 38, as shown in FIG. I have. This float switch 46
Is a donut-shaped float 46b,
b, a guide tube 46c having a magnetic permeability, which guides up and down in a vertical direction after restricting the ascending position by a stopper 46g; a reed switch 46e provided in the guide tube 46c; The reed switch 46e is provided on the inner periphery of the lower end of the
The water supply tank 3 includes a magnet 46f that is turned off, and detects that the water level in the water receiving container 38 has dropped from, for example, the full water level FL in FIG. 2 to a FL near a water inlet 41a of a first water supply pipe 41 described later. Outputs an empty notification signal notifying that is empty.

The notification signal is supplied to a later-described electric water supply pump 21 and a later-described water supply instruction lamp 68c on the operation board 66 via a later-described hot water supply control unit 70 to stop the electric water supply pump 21 and supply water. The instruction lamp 68c is turned on. As a result, cavitation of the electric water supply pump 21 described below is prevented, and the water supply tank 3 can be quickly replenished with water.

The water heater tank 2 is made of a heat conductive metal material such as an aluminum alloy that can be heated, and the above-mentioned heat-insulating lid member 8 can be opened and closed with respect to the upper opening 2b. On the lower surface of the bottom 2a, a heater plate 7 having a heater 7a embedded therein as a heating means for the heater and a hot water temperature sensor 7 are provided.
1 is provided. Then, the heater plate 7
The hot water tank 2 is heated by the
After boiling and descaling while checking the hot water temperature, the temperature is kept at a predetermined hot water temperature (90 to 98 ° C.). A hot water discharge port 9 to the outside is opened at a position near the outer periphery of the bottom portion 2a avoiding the heater plate 7,
The hot water discharge port 9 is connected to a hot water suction port 11 a of an electric hot water supply pump 11 via a first hot water supply pipe 10.

The hot water discharge port 11b of the electric hot water supply pump 11 is connected to a second hot water supply pipe 12 extending in the horizontal direction, a second hot water supply pipe 13 extending in the vertical direction, and an upper end of the second hot water supply pipe 13 as described above. The hot water supply port 14 extends in the direction of the lower opening 1b of the hot water supply port cover 1a of the main body case 1, and
By discharging the hot water in the water heater tank 2 to the outside through the third hot water supply pipe 14 with a directed downward, hot water is supplied to a desired container 50 as shown in the figure.

Further, a portion corresponding to an area outside the water heater tank 2 corresponding to a region below the full water level FL level of the water heater tank 2 and a predetermined water level ΔL level lower than the full water level FL level is described in detail in FIGS. 4 and 5, for example. Same water level Δ as shown
A float switch 16 for detecting a change (decrease) in L is provided. The float switch 16 has a cylindrical float chamber 16a and a donut-shaped float 16b inside the float chamber 16a which is loosely fitted to the outside.
Guide tube 16 for vertically guiding
c and a communication pipe (siphon) for communicating the water level (water level) in the water heater tank 2 from the bottom 2a of the water heater tank 2 into the float chamber 16a in correspondence with at least the fluctuation range ΔL of the water level. Tube) 16d, and a reed switch 16e provided in the guide cylinder 16c.
And a magnet 1 provided on the inner periphery of the lower part of the float 16b for turning on and off the reed switch 16e.
Consists of a 6f, the water level in the boiler tank 2, for example from full level FL shown in FIG. 4, detects and water replenishment signal that has dropped to the water supply level L ₁ shown in as few Figure 5 [Delta] L than Is output.

The water supply signal is supplied to the electric water supply pump 21 of the water supply tank 3 described below via a hot water supply control unit 70, which will be described later, and the electric water supply pump 21 is driven to enter the water receiving container 38. The supplied water from the water supply tank 3 is heated and supplied through a heating water supply path as described later.

As described above, the water supply tank 3 has the cylindrical water supply port 33 at the center of the cap 31 screwed openably and closably with the opening 30 on the bottom 3a side.
3 is provided with a water stop valve 36 that can be opened and closed by lifting and lowering. When the water supply tank 3 is supported on the water supply tank support member 6 in the main body case 1, the water stop valve 36 is protruded from the bottom 38 a of the water receiving container 38 by a valve body push-up member 34. Valve body 36a
Is opened upward against the urging force of the coil spring 36b,
The water supply port 33 is opened and a predetermined amount of water is retained in the water receiving container 38 as shown in the figure, and the inside of the water receiving container 38 is maintained in communication with the inside of the water supply tank 3.

On the other hand, the water receiving container 38 has a bottom 3
While connected to the water intake 21a of the electric water supply pump 21 via the first water supply pipe 41 opened near 8a,
The water discharge port 21b of the electric water supply pump 21 is
The above-described water heater tank 2 is supplied through the water supply pipes 42 and 43 of
When the electric water supply pump 21 is driven as described above, the water in the water receiving container 38 is supplied to the first, second, and third water supply pipes 41, 42, and 43. The water is supplied into the kettle tank 2 via the heater. In this case, the portion of the second water supply pipe 42 extending straight upward from below between the upstream end 42a and the downstream end 42b of the second water supply pipe 42 is provided by, for example, a bar-shaped water supply heater 60 as shown in an enlarged manner in FIG. It is inserted into the heater plate 63 to be heated, whereby
A heating water supply passage for heating water supplied to the water heater tank 2 to a boiling state is formed.

Therefore, the water supplied from the water receiving container 38 supplied through the first water supply pipe 41 is quickly heated to a boiling state by passing through the second water supply pipe 42, for example. Thereafter, the water is supplied into the kettle tank 2 through the third water supply pipe 43, so that the temperature of the hot water in the kettle tank 2 does not decrease.

Then, as described above, the water heating tank 2
When the hot water in the water heater tank 2 reaches the full water level FL, the float switch 1 is turned on.
6 rises and the reed switch 16
Since e is turned off and the supply of the water supply signal to the electric water supply pump 21 is stopped, the drive of the electric water supply pump 21 is stopped, and the water supply ends.

In this way, when the amount of hot water for the fixed amount ΔL decreases, the hot water for the fixed amount ΔL corresponding to the reduced amount is continuously replenished into the kettle tank 2. As a result, a constant amount (full water level) of the amount of hot water is maintained in the water heater tank 2 almost without change in temperature.

[0050] Incidentally, the reed switch 16e is in the above-described guide cylinder 16c, so that the ON when the float 16b is OFF when the full level level FL position, the ΔL only water level is lowered to L ₁ position lowered Although the position is set, the water level drop width ΔL for performing the ON / OFF operation is set to a value as small as possible within a range where hunting does not occur.

On the other hand, as described above,
When the supply of water from is continued, the water in the water supply tank 3 eventually runs out.

However, in the above configuration, when the water in the water supply tank 3 runs out as described above and the water level in the water receiving container 38 falls below the predetermined level EL as shown in FIG. The fact that the reed switch 46e has been operated and the water supply tank 3 has been emptied is notified by lighting of the water supply instruction lamp 68c. On the other hand, the handle portion 32 is provided on the upper portion of the water supply tank 3 as described above, and the handle portion 32 can be taken out from the opening 1c of the main body case 1 by holding the handle portion 32. . Therefore, when the water supply instruction lamp 68c is turned on as described above, the water supply tank 3 is taken out of the main body case 1 and turned upside down to remove the cap 31 on the side of the bottom opening 30. Since new water can be replenished from 30, after replenishing the same water, the cap 31 is tightened and stored again in the main body case 1 as shown in FIGS. 1 and 2, as described above. Continuous replenishment of water can be made possible again.

By the way, the operation board 66, the float switches 16, 46, and the hot water temperature sensor 7 configured as described above
1. Each of the water heater 7a, the feed water heater 60, the electric hot water supply pump 11, and the electric water feed pump 21 is shown in FIG.
Is connected to a hot water supply control unit 70 on the control board 72 via the control board 72 as shown in FIG.

The control circuit controls the hot water supply from the inside of the water heater tank 2 to the outside,
Water supply control to the hot water tank 2 from the water supply, empty notification control of the water supply tank 3 and the like are appropriately performed.

(Modification 1) FIG. 8 shows a configuration of a main part of an electric water heater according to Modification 1 of Embodiment 1 described above.

As described above, in the configuration of the first embodiment, the second water supply pipe 42 that forms a heating water supply path from the water supply tank 3 to the water heater tank 2 is connected to the water supply heater 6.
0 through the heater plate 63 provided with the second water supply pipe 4.
2 is heated to a boiling state to prevent the temperature of the hot water in the water heater tank 2 from dropping. In the case of this configuration, the heater plate 63 of the second water supply pipe 42 is used. And the heat transfer area between them is small and the heat transfer time is short. Therefore, the heating efficiency at the time of water supply is not always sufficient.

Therefore, in the configuration of the first modified example, as shown in FIG. 8, for example, the width of the heater plate 63 is increased so that the distance from the upstream end 42a to the downstream end 42b of the second water supply pipe 42 is increased. It is bent into a U shape a plurality of times (twice in the illustrated example) and inserted into the heater plate 63.

With such a configuration, the heat transfer area between the second water supply pipe 42 and the heater plate 63 is increased, and the heat transfer time is increased, so that the heating efficiency in the water supply process is improved.

As a result, the water supplied to the water heater tank 2 can be more easily heated to a boiling state than in the case of the configuration of the first embodiment described above.

(Modification 2) FIG. 9 shows a configuration of an electric water heater according to Modification 2 of Embodiment 1 described above.

As described above, in the configuration of the first embodiment, the second water supply pipe 42 is heated in order to prevent a decrease in the temperature of hot water when water is supplied from the water supply tank 3 to the water heater tank 2. A heater plate 63 is provided.

However, in the same configuration, as is apparent from FIG. 1 described above, the heater plate 63 is located substantially in the middle between the heat insulating material 64 on the water supply tank 3 side and the water heater tank 2 and has substantially equal intervals a and b, respectively. It is provided separately.

Therefore, when viewed from the water supply tank 3 side,
While the heat insulation performance via the heat insulating material 64 is deteriorated by an amount closer to the heater plate 63, when viewed from the water heater tank 2 side,
The amount of heat radiation from the heater plate 63 is equal to
It is not working effectively on itself.

Therefore, in the configuration of the second modified example, as shown in FIG.
a, the length of the downstream end 4 of the pipe 42 is increased.
By making the length of the portion 2b short, the heater plate 63 is provided so as to be as close as possible to the side wall 2c of the kettle tank 2 as large as possible.

As a result, as shown in the figure, the distance a between the heat insulating material 64 and the heater plate 63 on the water supply tank 3 side is different from that shown in FIG.
In this case, the heat insulation performance for the water supply tank 3 is improved, and the amount of heat radiated from the heater plate 63 can be effectively applied to the water heater tank 2. Efficiency is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of an electric water heater according to Embodiment 1 of the present invention.

FIG. 2 is an enlarged sectional view of a water receiving container portion of the electric water heater in a first state.

FIG. 3 is an enlarged cross-sectional view of a second state of the water receiving container portion of the electric water heater.

FIG. 4 is an enlarged cross-sectional view of a first state of a water-tank-side float switch of the electric water heater.

FIG. 5 is an enlarged sectional view of a second state of the water-tank-side float switch of the electric water heater.

FIG. 6 is an enlarged rear view of a feed water heater of the electric water heater.

FIG. 7 is an electric circuit diagram of the electric water heater.

FIG. 8 is a sectional view of a main part of Modification Example 1 of the electric water heater.

FIG. 9 is a sectional view of a second modification of the electric water heater.

[Explanation of symbols]

1 is a main body case, 2 is a water heater tank, 3 is a water supply tank,
3a is a bottom portion, 7 is a heater plate, 7a is a water heater, 8 is a lid member, 9 is a hot water outlet, 10 is a first hot water supply pipe, 11 is an electric hot water supply pump, 12 is a second hot water supply pipe,
14 is a fourth hot water supply pipe, 16 is a float switch, 2
1 is an electric water pump, 30 is an opening, 31 is a cap,
33 is a water supply port, 38 is a water receiving container, 41 is a first water supply pipe, 42 is a second water supply pipe, 43 is a third water supply pipe, and 60 is a water supply heater.

Claims (7)

(57) [Claims] 1. A water heater for storing a predetermined amount of water, a heating means for heating the water in the water heater, and a supply of water to the water heater in response to a decrease in the water in the water heater. Water tank and optional water tank
Water tank that can be stored or taken out of the tank
An electric water heater comprising a storage support portion;
At the bottom of the water tank storage support,
A water receiving container for retaining a predetermined amount of water from a water port, and the water receiving container;
Supply the water in the vessel to the kettle tank via the water supply channel
Electric water pump and the water heater tank
Electrostatic you hot water outside the water in the boiler tank via the hot water passage
Near the water level on the hot water tank side with the hot water supply pump
The water level in the water heater tank is higher than the full water level
Water level drop detection means for detecting that the water level has dropped,
The above-mentioned water heater is set in accordance with the detection result of the water level drop by the drop detection means.
So that the water in the tank reaches the full level.
Electric water supply pump drive control means for driving and supplying water.
An electric water heater characterized by being provided . 2. The electric water heater according to claim 1, wherein the water supply tank is provided beside the water heater tank. 3. A water supply tank is provided at a water supply port of the water supply tank.
A water stop valve is provided to close the water supply port in the outflow state.
The electric hot water supply according to claim 1 or 2, wherein
vessel. 4. A water supply passage from a water supply tank to a water heater tank.
Is provided with a heating means.
Item 6. An electric water heater according to item 1, 2 or 3. 5. The water level in the water receiving container is set in the water receiving container.
Water level drop detection means for detecting
The electric hot water supply according to claim 1, 2, 3, or 4, wherein
vessel. 6. A water level lowering detecting means in the water receiving container comprises
Detects that the water level in the receiving vessel has dropped below the specified water level
Then, the drive of the electric water pump was stopped
The electric water heater according to claim 5, wherein 7. The water level lowering detecting means in the water receiving container includes
Detects that the water level in the receiving vessel has dropped below the specified water level
To alert you that the water in the water tank is empty.
7. The method according to claim 5, wherein
Electric water heater.